What if the diesel car's warm air is not hot?

What if the car heater is not hot? There are many reasons why the automobile heater is not hot, such as the failure of the heater control mechanism, the lack of engine coolant, and the failure of the radiator. The principle of car heating is simple. When the heater switch is turned on, the high-temperature coolant in the engine will flow through the heater radiator. There is a blower behind the radiator, so the air outlet is adjusted to blow warm air. The reason why warm air is not hot: 1. Insufficient coolant. Water-cooled engines rely on the continuous circulation of coolant to dissipate heat. Without coolant, the temperature of coolant will be high, but warm air will not be hot. This is because after the warm air is turned on, there is not enough coolant to enter the warm air box, so the warm air is not hot. The radiator of the heater is damaged. If the radiator of the heater is damaged, the heat of the coolant cannot enter the cab after the blower is turned on. 3. The heater water valve is damaged. If the valve is damaged, the coolant will not enter the heater radiator. If the car doesn't have warm air, first check whether the car is short of coolant, then check the warm air radiator and warm air valve, and check whether the warm air control switch is in good condition. Coolant needs to be replaced every two years, otherwise the freezing point will rise and the boiling point will drop.